(function () {
  var cache = {};

  this.tmpl = function tmpl(str, data) {

    //
    // Figure out if we're getting a template, or if we need to
    // load the template - and be sure to cache the result.
    //
    var fn = !/\W/.test(str) ?
        cache[str] = cache[str] ||
            tmpl(document.getElementById(str).innerHTML) :

      //
      // Generate a reusable function that will serve as a template
      // generator (and which will be cached).
      //
        new Function("obj",
            "var p=[],print=function(){p.push.apply(p,arguments);};" +

              // Introduce the data as local variables using with
                "with(obj){p.push('" +

              // Convert the template into pure JavaScript
                str
                    .replace(/[\r\t\n]/g, " ")
                    .split("<%").join("\t")
                    .replace(/((^|%>)[^\t]*)'/g, "$1\r")
                    .replace(/\t=(.*?)%>/g, "',$1,'")
                    .split("\t").join("');")
                    .split("%>").join("p.push('")
                    .split("\r").join("\\'")
                + "');}return p.join('');");

    // Provide some basic currying to the user
    return data ? fn(data) : fn;
  };
})();
